fix: use updated documentation source for Hecke #15741

Job	Run time
doctest (1.10, ubuntu-latest)	23m 57s
doctest (1.11-nightly, ubuntu-latest)	23m 22s
test (1.6, short, ubuntu-latest)	1h 8m 54s
doctest (nightly, ubuntu-latest)	26m 52s
test (1.6, long, ubuntu-latest)	54m 13s
doctest (1.10, ubuntu-latest, depwarn=error)	24m 47s
test (1.10, short, ubuntu-latest)	52m 4s
doctest (1.10, macOS, RPTU)	1m 34s
test (1.10, long, ubuntu-latest)	44m 15s
test (1.11-nightly, short, ubuntu-latest)	1h 5m 16s
test (1.11-nightly, long, ubuntu-latest)	51m 28s
test (nightly, short, ubuntu-latest)	1h 5m 41s
test (nightly, long, ubuntu-latest)	50m 26s
test (1.10, short, ubuntu-latest, depwarn=error)	51m 58s
test (1.10, long, ubuntu-latest, depwarn=error)	44m 34s
test (1.10, short, macOS, RPTU)	11m 38s
test (1.10, long, macOS, RPTU)	12m 17s
test (1.10, book, ubuntu-latest)	49m 17s
	12h 2m 33s

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